Getting burning sensations from doing a parasite cleanse or Liver Flushing is obviously not normal and you're GI must have been severely damaged, highly toxic, and possibly highly infested. The first step is obviously healing it up, which you've done.
If someone's intestines are so damaged they can't even eat basic foods (olive oil), then the best way I know of healing it is through water-only fasting. How did you heal your intestines to the point where you are now?